If we got rid of dyslexia as a category, there is still going to have to be prioritization between different kids based on their relative abilities, there are still going to need to be tests to determine whether someone is struggling enough to need free assistance and access to special resources. If you just get rid of the category but don't address the systemic problems of people being able to pay for diagnosis, then you haven't solved anything. Because that category doesn't go away just because it's called something else. The category is, "who is getting special access to resources, and who is considered functional enough to leave where they are?"
It's the prioritization and diagnosis that sounds broken, not the word.
What these people should be campaigning for is to expand dyslexia to cover more kids who don't fit into the tidy, innacurate IQ box, and to set up more impartial diagnosis methods that aren't as subject to monetary abuse. The dyslexia critics are quick to point out that they're not trying to get rid of resources, they're trying to expand access. But the only way that getting rid of designations would be an equalizer is if it's exactly the scenario that dyslexic kids/parents are worried about -- that nobody gets resources or special attention any more; that the category itself stops existing.
If these researchers genuinely do want to help people, then I don't get what their end goal is -- it sounds like they're just playing pedantic word games. Just expand access, why is worth worrying about what word people use?
I mean, what should we call the category that describes, "child with a reading disability that needs special attention and extra government resources from the limited budget we have?" How about the word that's already widely used that pretty much everybody already understands? How is it helpful to anyone to have this fight instead of just expanding the existing category to fit more people?